I re-ghosted a Windows box today, so I decided to set up Macromedia Flex with Apache Tomcat. Shooting from the hip, I just unzipped the Flex samples.war file into Tomcat's webapps directory with all the other web applications. Initially excited to see if everything would just work right out of the box with no further configurations, I launched the Flex Samples Explorer application. The application compiled, and the main Explorer interface loaded. However, the Hello World mini-app, which is the first one to load by default, threw a pop-up alert for:

HTTPService Fault
Internal Server Error